COMBINED CHAIR

Abstract: The invention provides combined chairs which can be separately used and which can be combined together into a unit for use. A plurality of the chairs, respectively, comprise a seat supported by legs, and a backrest provided on the seat. These chairs are constructed such that when they are combined with the seats of the respective chairs vertically superposed one upon another, the respective backrests are made adjacent to one another with one widthwise sides thereof joined to one another, and the respective legs are set in length to have lower ends thereof aligned with one another.

Description: Technical Field The present invention relates to a combination chair according to the preamble portion of claim 1, which can be used as one chair by combining a plurality of chairs. Background Art In a dining room, for example, a table and a plurality of chairs are provided. Usually, the chairs are prepared so as to correspond to the number of members in the family. Therefore, in the case where there is a guest or the like, and the number of people using the dining room increases, the number of chairs must be increased in accordance with the number of guests added. It is possible that extra chairs are always prepared for guests in advance; however extra chairs occupy some space in the room. Therefore, when they are not used, they take up much space. In a house of a narrow living space, it is, in many cases, difficult to reserve a space for placing extra chairs. In this connection, document US-A-1 886 172 forming the preamble portion of claim 1 discloses a combination chair comprising a plurality of chairs A, B, C and D, each of which having a seat supported by legs and a backrest provided on the seat. The length of the legs is set so that lower ends thereof are in the same horizontal plane when the chairs A, B, C and D are combined by stacking the seats in a vertical direction. One particular disadvantage of this state of the art, however, consists in that the known combination chair provides for a rigid structure only when all chairs A, B, C and D of the combination chair are stacked upon each other so that the rear legs of the upper chairs A, B and C are accommodated in cutaway portions of chair D and abut the shoulders of these cutaway portions. Further, the known combination chair has a rather bulky appearance when the chairs are stacked upon each other. Disclosure of Invention The object of the present invention is to further develop the above combination chair to the effect that it always provides for a rigid structure whilst having a pleasant appearance. This object is solved by the features indicated in the characterizing portion of claim 1. An advantageously developed embodiment of the invention is subject-matter of claim 2. According to the invention, when the seat portions are stacked up in the vertical direction, the backrests as well as the legs of the chairs are joined to be adjacent to each other such that a vertical edge of one backrest is in contact with a vertical edge of another backrest. With the above-described structure, a plurality of chairs can be used separately as a single chair, and they can be combined together to be used as one chair. Therefore, the present invention can follow an increase/decrease in the number of users. When the plurality of chairs are combined together, the slipping movement in the vertical direction and horizontal direction can be suppressed, and therefore the combination chair can be easily used as one chair whilst having a good appearance. Brief Description of Drawings FIGS. 1A, 1B and 1C are perspective views of a combination chair according to one embodiment of the present invention, FIG. 1A being a perspective view showing a first chair, FIG. 1B being a perspective view showing the first and second chairs while being stacked up, and FIG. 1C being a perspective view showing the first and second chairs which have been stacked up; FIGS. 2A and 2B show the first chair, FIG. 2A being a plan view thereof and FIG. 2B being a front view thereof; FIGS. 3A and 3B show the second chair, FIG. 3A being a plan view thereof and FIG. 3B being a front view thereof; FIGS. 4A and 4B show the first and second chairs combined, FIG. 4A being a plan view thereof and FIG. 4B being a front view thereof; FIGS. 5A, 5B and 5C show a seat portion of the chairs, FIG. 5A being a plan view of a lower surface side of the seat, FIG. 5B being a side view of the seat taken along the line A-A in FIG. 5A, and FIG. 5C being a cross section taken along the line B-B in FIG. 5A; FIG. 6 is a side view of a front leg; FIG. 7 is a side view of a rear leg; and FIGS. 8A and 8B show a modified version of the above embodiment, FIG. 8A being a plan view showing three chairs which are combined and FIG. 8B being a front view of such a combination. Best Mode of Carrying Out the Invention Embodiments of the present invention will now be described with reference to drawings. FIGS. 1 to 7 show one embodiment of the present invention. A combination chair according to this embodiment consists of two chairs, as shown in FIGS. 1A to 1C, 2A, 2B, 3A and 3B, more specifically, a first chair 1a and a second chair 1b having different shapes (in terms of measurements) though they appear to be substantially identical. The first and second chairs 1a and 1b include disk-shaped seat portions 2a and 2b of the same size, respectively. Each of the seat portions 2a and 2b is supported by four legs 3a and 3b at a predetermined height. Each of the seat portions 2a and 2b is jointed to the legs 3a and 3b as shown in FIGS. 5A to 5C. More specifically, two L-shaped grooves 4 are formed on the lower surface of each of the seat portions 2a and 2b as shown in FIG. 5A. The L-shaped grooves 4 abut to each other by their outer edges of angle portions at the center of each of the seat portions 2a and 2b, and the ends of the L-shaped grooves are opened to the outer surfaces of the seat portions 2a and 2b in the circumferential direction at an interval of 90 degrees. Within the angle portion of each L-shaped groove 4, a step portion 5 having a width of about a half of that of the groove 4 and a height of about a half of the depth of the groove 4, is formed to project. Of the legs 3a and 3b, each of two front legs 3a-2, 3b-2 consists of a joint portion 6 which is made substantially horizontal by bending a wood or metal material into an L-shape, and a support portion 7 which is substantially vertical as shown in FIG. 6. The end of the joint portion 6 is cut at an angle of 45 degrees to be a fit portion 8 as shown in FIG. 5A, and the upper surface thereof has a recess portion 9 which engages with the step portion 5. Among the legs 3a and 3b, the joint portions 6 of a pair of the front legs 3a-2 and 3b-2 are inserted respectively into one and the other ends of each one of the L-shaped grooves 4, so that each recess portion 9 engages with the corresponding one of step portions 5. Thus, the fit portions 8 of the ends of a pair of the joint portions 6 are placed to match with each other, and while maintaining the matching state, the pair of the front legs 3a-2 and 3b-2 are fixed to that one of the L-shaped grooves 4 by screws or adhesive (not shown). With this structure, the support portions 7 of the pair of front legs 3a-2 and 3b-2 project downward from the outer circumferential surface of each of the seat portions 2a and 2b. A pair of rear legs 3a-1 and 3b-1 have a structure as shown in FIG. 7, in which a joint portion 6, a support portion 7 and a mount portion 12 consisting of backrests 11a and 11b, are integrated into one body. More specifically, the support member 7 and the mount portion 12 are made from one piece material, and the joint portion 6 is integrated by its one end portion to the material at the mid portion thereof, so as to project substantially horizontally therefrom. The joint portions 6 of each pair of rear legs 3a-1 and 3b-1 are inserted into the other one of the L-shaped grooves 4 of each of the seat portions 2a and 2b. Thus, the pair of the rear legs are fixed to the groove in the same manner as for the front legs. On the upper side of each of a pair of the mount portions of each of the chairs 1a and 1b, a back plate 13 bent along the circumferential direction of the corresponding seat portion 2a and 2b is provided so as to be angled in a range of about 90 degrees in the circumferential direction of the corresponding seat portion 2a or 2b. With regard to four legs 3a and 3b of the first and second chairs 1a and 1b, two rear legs 3a-1 and 3b-1 and two front legs 3a-2 and 3b-2 are placed to be located on both ends of the circumferential direction within two regions which are point symmetrical, in the case where each of the disk-shaped seat portions 2a and 2b is divided into four areas a to d by two lines X and Y normally crossing with each other as shown in FIGS. 2A and 3A. The arrangement of the four legs 3a and 3b of the first chair 1a is the same as that of the second chair 1b. FIGS. 3A and 3B show the state with reference to that shown in FIGS. 2A and 2B, that is, FIGS. 3A and 3B illustrate that the second chair 1b is rotated by 90 degrees with respect to the first chair 1a. When the two rear legs 3a-1 of the first chair 1a are located in the area d as shown in FIG. 2A, the front legs 3a-2 are automatically located in the area b, whereas when the two rear legs 3b-1 of the second chair 1b are located in the area c as shown in FIG. 3A, the front legs 3b-2 are automatically located in the area c. The first and second chairs 1a and 1b differ from each other in the height of supporting each of the seat portions 2a and 2b. More specifically, as shown in FIG. 2B and FIG. 3B, where H1 represents the height of the seat portion 2a of the first chair 1a, and H2 represents the height of the seat portion 2b of the second chair 1b, the relationship therebetween is H1 < H2. The measurements of the supporting members 7 of the legs 3a and 3b of the first and second chairs 1a and 1b are determined so that the difference in height (H2 - H1) is substantially the same as the thickness of the seat portion 2b of the second chair 1b. With regard to the backrests 11a and 11b of the first and second chairs 1a and 1b, the lengths of the mount portions 12 are determined so that the upper ends of the back plates 13 of the chairs 1a and 1b are leveled. More specifically, the length of the mount portion 12 of the first chair 1a is set larger than that of the mount portion 12 of the second chair portion 1b by the thickness of the seat portion 2b of the second chair 1b. According to the combination chair having the above-described structure, each of the first chair 1a and the second chair member 1b can be independently used as a chair. For example, when two pairs of combination chairs are prepared, four chairs can be used for four people. In contrast, when the number of user reduces from four to two, each of the first chairs 1a is stacked upon the corresponding one of the second chairs 1b, thus reducing the number of chairs from four to two. More specifically, as shown in FIGS. 1B, 2A and 3A, the seat portion 2b of the second chair 1b is stacked upon the seat portion 2a of the first chair member 1a in such a manner that the seat portion 2b is rotated by 90 degrees in the clockwise direction with respect to the seat portion 2a. With this operation, the backrest 11a of the first chair 1a and the backrest 11b of the second seat portion 1b are placed adjacent to each other with one end of the backrest 11a being in contact with one end of the backrest 11b, thus surrounding a part of the seat portions 2a and 2b in a range of 180 degree in the circumferential direction. Therefore, the two backrests 11a and 11b appear to be one backrest as a whole. Further, one of the front legs 3b-2 of the second chair 1b is placed to be adjacent to and in contact with one of the front legs 3a-2 of the first chair 1a, and the other front legs 3a-2 and 3b-2 are placed to be adjacent to and in contact with one of the rear legs 3b-1 of the second chair 1b and one of the rear legs 3a-1 of the first chair 1a, respectively. The two legs placed to be in contact with and adjacent to each other have an appearance of one leg, and such a structure is good in appearance. As described above, with a structure in which the backrests 11a and 11b and the front and back legs 3a and 3b are placed to be adjacent to and in contact with each other, the second chair 1b is prevented from rotating with respect to the first chair 1a in the circumferential direction, and thus the first chair is integrally stacked upon the second chair. When the lower surface of the seat portion 2b of the second chair 1b is stacked upon the upper surface of the seat portion 2a of the first chair 1a, the lower ends of the legs 3a and 3b of these chairs are located at the same position, more specifically, to coincide with each other. With this structure, the legs 3a and 3b of both chairs 1a and 1b are grounded on the floor, and therefore the stacked two chairs 1a and 1b are not rendered loose, since the second chair 1b whose seat portion 2b is placed on the upper side, is not set unstable. Further, the joint portions 6 of the rear legs 3a-1 and 3b-1 and the front legs 3a-2 and 3b-2 are embedded in the grooves 4, and the support portions 7 are rendered to project from the outer circumferences of the seat portions 2a and 2b. With this structure, these legs do not project from the lower surfaces of the seat portions 2a and 3b. Consequently, when the lower surface of the seat portion 2b of the second chair 1b is stacked upon the upper surface of the seat portion 2a of the first chair 1a, these seat portions can be accurately jointed together without looseness. As described above, the combination chair of the present invention is not simply a chair formed by stacking the first chair 1a upon the second chair 1b, but the combination chair has an appearance as if it is one chair, with the structure in which the seat portions 2a, 2b, the legs 3a and 3b, and the backrests 11a and 11b are jointed up to down and side to side. Therefore, even if two chairs 1a and 1b are used as one chair, the appearance of such a combination chair is natural, and in fact, excellent, and the combination chair can be easily used. Further, with the structure in which the two backrests 11a and 11b are jointed side by side, the two backrests can be used not only as a backrest, but also as an armrest. FIG. 8 shows a remodeled version of the above embodiment. In this version, first to third chairs 1a, 1b and 1c are stacked up into one combination chair. In the following description, structural elements of the first and second chairs 1a and 1b, which are the same as those of the above-described first embodiment, are designated by the same reference numerals, and a seat portion, legs and a backrest of the third chair 1c are designated by 2c, 3c and 11c, respectively. In order to achieve the following constitution of the three chairs 1a to 1c, the chairs are formed as described as follows. That is, the lengths of the legs 3b and 3c of the second and third chairs 1b and 1c are determined so that the legs 3b and 3c are both grounded when the seat portions 2a to 2c of the chairs 1a to 1c are stacked up together. The backrests 11a to 11c are formed so that they are leveled at the same height when the chairs are stacked up together. Further, the three backrests 11a to 11c are formed so that they cover a range of about 180 degrees of the outer circumferences of the seat portions 2a to 2c, with each backrest covering a range of 60 degrees in the circumferential direction of its seat portion, when the three backrests 11a to 11c are placed adjacent to each other. With the above-described constitution, the number of chairs can be changed from one to three or vice versa, in accordance with a change in the number of users, and therefore the range of usage is further expanded as compared to the case where two chairs are combined, thus increasing the utility of the chair combination. In the above embodiment, the description was provided in connection with the case where the seat portions of chairs are of a round shape; however the seat portions may be of a shape other than a round type, such as a rectangular type including square or a hexagonal type. Advantage of the Invention As described above, the present invention has the structure in which a plurality of chairs each having a seat portion supported by legs and a backrest provided on the seat portion, can be stacked up together, without looseness or having a shaky movement. With the plurality of chairs, the number of chairs can be increased or decreased in accordance with an increase or decrease in the number of users. A plurality of chairs are stacked up when the number of chairs is decreased, and therefore an extra space is not necessary. Further, the plurality of chairs stacked up are prevented from being loose, and they do not shakily move. Therefore, the chairs, if they are combined, can be easily used.

Claims: A combination chair, comprising a plurality of chairs (1a, 1b) each having a seat portion (2a, 2b) supported by legs (3a, 3b) and a backrest including two vertical edges (11a, 11b), wherein the length of said legs (3a, 3b) is set so that lower ends thereof are in the same horizontal plane when said chairs (1a, 1b) are combined by stacking said seat portions (2a, 2b) in a vertical direction, characterized in that , when said seat portions (2a, 2b) are stacked up in the vertical direction, said backrests (11a, 11b) as well as said legs (3a, 3b) of said chairs (1a, 1b) are joined to be adjacent to each other such that a vertical edge of one backrest (11a) is in contact with a vertical edge of another backrest (11b). A combination chair according to claim 1, characterized in that said seat portions (2a, 2b) are formed in a circular shape, wherein said backrests (11a, 11b) are arranged to be adjacent to each other along a circumferential direction of said seat portions (2a, 2b) when said seat portions (2a, 2b) are stacked up in the vertical direction.

Inventors: HIRAMATSU NATSUKO, IKEDA SHIGERU, IWASHITA HIDEKI, MATSUMOTO HISAO, TAKAGI SHIN, UMEMOTO HISAYA, HIRAMATSU, NATSUKO, IKEDA, SHIGERU, IWASHITA, HIDEKI, MATSUMOTO, HISAO, TAKAGI, SHIN, UMEMOTO, HISAYA
Applicants: FRANCE BED CO, FRANCE BED COMPANY, LIMITED
Application year: 1994
Main classification: A47C3
IPC codes: A47C3, A47C1